JP4367927B2 - Method and apparatus for mounting a bladder unit device for forming and vulcanizing a pneumatic radial tire - Google Patents

Description

  The present invention relates to a mounting method and a mounting apparatus for a bladder unit device for forming and vulcanizing pneumatic radial tires, and more particularly, for example, in a forming step of a radial tire for a construction vehicle, using a first stage molding machine. The present invention relates to a bladder unit method capable of easily attaching a molding / vulcanizing bladder unit device mounted on a molded primary green tire to a molding spindle of a second stage molding machine, and an attachment device therefor.

  In recent years, large tires for construction vehicles, called OR tires (Off the Road Tire), have been increasing in production of radial tires due to the increase in size and speed of vehicles.

  In such a radial tire manufacturing method, a primary green tire (unvulcanized tire) forming a tire skeleton such as a carcass ply or a bead core is first molded by a first stage molding machine, and then the primary green tire is second stage. Inflate until the specified outer diameter is achieved by the bladder mechanism of the molding machine, form a belt and tread rubber around the outer periphery and form a finished green tire, and then inflate the finished green tire with a vulcanizing bladder. Then, it is molded so as to be vulcanized with a vulcanizer.

  Conventionally, as an improvement of a method for manufacturing a pneumatic radial tire, a technical idea has been proposed in which an inflation bladder for a second-stage molding machine and an inflation bladder for a vulcanizer are combined (for example, patents). Reference 1).

However, when such a molding and vulcanization bladder unit is inserted into the molding spindle of the second stage molding machine, it is necessary to match the center of the three widths during molding with the molding center of the second stage molding machine. The conventional apparatus has a problem that it is very difficult to match.
Japanese Patent Laid-Open No. 49-15776

  The present invention pays attention to such a conventional problem, and the molding center of the molding spindle of the second-stage molding machine is a vulcanization bladder unit for both molding and vulcanization mounted on the primary green tire molded by the first-stage molding machine. It is an object of the present invention to provide a mounting method and a mounting device for a bladder unit device for forming and vulcanizing a pneumatic radial tire that can be easily mounted on the tire and improve the quality of the tire. is there.

In order to achieve the above object, the invention provides a method for attaching a bladder unit device for forming and vulcanizing a pneumatic radial tire. The inner diameter of a primary green tire (Wa) formed by a first stage molding machine (11) is used. Method of mounting the bladder unit device which attaches the vulcanization bladder unit (16) for both forming and vulcanization with the bead interval adjusting mechanism (22) attached to the molding part to the molding spindle (17a) of the second stage molding machine (17) When the primary green tire (Wa) equipped with the vulcanization bladder unit (16) is attached to the molding spindle (17a) of the second stage molding machine (17) , the inner diameter of the vulcanization bladder unit (16) The gist is to insert and install the adapter unit (35) that can adjust the width center of the vulcanization bladder unit (16) and the molding center of the second stage molding machine (17) in advance. Is.

Here, in which by inserting a cassette (38) to adjust the forming width between the shaping mandrel (17a) and said adapter unit (35).

The pneumatic radial tire molding and vulcanization bladder unit mounting apparatus according to the present invention has an upper mold clamp on the inner diameter of the primary green tire (Wa) molded by the first stage molding machine (11). A cylindrical bladder (15) clamped to the ring (13) and the lower clamp ring (14) is provided, and bead intervals (B1) and (B2) during tire molding and bead intervals (B3 during tire vulcanization ) ) A vulcanizing bladder unit (16) for both forming and vulcanization with a bead interval adjustment mechanism (22) that changes in multiple stages is inserted into the main spindle (17a) of the second stage molding machine (17). A second center molding unit between the molding spindle (17a) of the second stage molding machine (17) and the vulcanization bladder unit (16) and the center of the width of the vulcanization bladder unit (16). der which machine that is interposed (17) molded around an adjustable adapter unit to match (35) and Summary .

Here, between the adapter unit (35) and shaping mandrel (17a), intended to be interposed cassette (38) for adjustment divided molded width, the adapter unit (35) is a multi-stage shaft diameter The vulcanized bladder unit is composed of a first adapter (36) having a cylindrical step that engages with a step portion of the molded main shaft (17a) that has been changed in various ways, and a plate-like second adapter (37). The front and rear ends of (16) are attached with the first adapter (36) and the plate-like second adapter (37) sandwiched and fixed.

  By configuring in this way, the bladder unit device for both molding and vulcanization attached to the primary green tire molded by the first stage molding machine can be easily formed with respect to the molding center of the molding spindle of the second stage molding machine. It can be attached and the quality of the tire can be improved.

Since the present invention is configured as described above, the following excellent effects can be obtained. (A) By replacing the shaping function of the second stage molding machine (the function of inflating the secondary green tire) with the shaping function for the vulcanization process, pneumatic radial tires are produced using only the existing first stage molding machine. Therefore, the equipment cost can be reduced.
(B) Since the bladder unit device in the belt and tread state can be used as it is in the vulcanization process, the productivity can be improved, and the center mechanism for changing the bead interval is provided so that appropriate processing can be performed. Furthermore, since the green tire is not transferred to the vulcanization bladder unit, the quality can be improved.
(C) Since the cylindrical primary green tire is inflated to a shape that can be substantially vulcanized by the vulcanization bladder, the bladder is inflated for vulcanization in the drum-shaped secondary green tire. Compared with the case of making it possible, problems such as air remaining between the vulcanization bladder and the secondary green tire can be solved, and the quality can be improved.
(D) Along with the change in the three widths of the molding and vulcanizing bladder unit device, the mounting of the adapter for mounting the second stage molding machine and the mechanism for matching the center of the molding 3 width with the molding center of the second stage molding machine Since it has a simple configuration that does not use a mechanism such as a cylinder, the equipment cost can be reduced.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 (a) to 1 (l) show schematic configuration diagrams of, for example, a manufacturing process of a pneumatic radial tire for a construction vehicle in which the present invention is implemented. In this manufacturing process, FIG. The process of manufacturing the primary green tire Wa in the molding drum 12 of the molding machine 11, FIG. 1 (b) does not attach a belt tread or the like to the primary green tire Wa removed from the molding drum 12 of the first stage molding machine 11. FIG. 1 (c) shows a cylindrical bladder 15 clamped by an upper mold clamp ring 13 and a lower mold clamp ring 14 at the inner diameter of the primary green tire Wa. wearing the vulcanized bladder unit 16 having, by vulcanization bladder unit 16 to the bead spacing of the primary green tire Wa to B _1, introducing a pressurized fluid such as compressed air to the bladders 15 A primary green tire Wa inflate Te, to the outer diameter of the primary green tire Wa to D.

FIG. 1D shows that the primary green tire Wa is made to have a bead interval B ₂ by the vulcanization bladder unit 16 and a pressurized fluid such as compressed air is introduced into the bladder 15 to inflate the primary green tire Wa. At this time, the primary green tire Wa held at a predetermined bead interval B ₂ is held by the outer diameter D ₂ necessary for attaching the belt tread or the like in the second stage molding machine 17 by a conveying device 18 such as a carriage. This is a step of conveying the primary green tire Wa to the position of the reversing device 19.

  FIG. 1 (e) shows a process of horizontally transferring the primary green tire Wa to the reversing device 19, and FIG. 1 (f) shows the turning operation of the primary green tire Wa in the horizontal state by 90 ° in the vertical state. Process, Fig. 1 (g) shows the primary green tire Wa in a vertical state is attached to the molding spindle 17a of the second stage molding machine 17 together with the vulcanization bladder unit 16, and the belt tread T is wound around the primary green tire Wa. FIG. 1 (h) shows a step of attaching the formed secondary green tire Wb to the reversing device 19 again in the vertical direction. FIG. 1 (i) shows a step of forming the secondary green tire Wb. The step of turning 90 ° horizontally by the reversing device 19, FIG. 1 (j) is the step of transferring the secondary green tire Wb from the reversing device 19 to the conveying device 20 such as a carriage.

Figure 1 (k) is a secondary green tire Wb and the bead spacing B ₃ by vulcanization bladder unit 16, pressure such as compressed secondary green tire Wb so that the outer diameter D ₂ of the vulcanization air the step of inflating by introducing a fluid, FIG. 1 (l) of the vulcanization mold vulcanizer while wearing the vulcanized bladder unit 16 a secondary green tire Wb molded to the outer diameter D ₂ of the vulcanization No. 21, and the secondary green tire Wb is heated and pressurized in the vulcanization mold 21 while maintaining the inflated state, and is cured to complete a pneumatic radial tire.

  As shown in FIG. 2, the attaching device for the vulcanization bladder unit 16 of the present invention implemented in the manufacturing steps of FIGS. Between the sulfur bladder unit 16, a divided adapter unit 35 with adjustable molding width is interposed and attached.

  That is, the adapter unit 35 includes a first adapter 36 with a cylindrical step that engages with a step portion 17x of the molding main shaft 17a whose shaft diameter d is changed in multiple steps, and a plate-like second adapter 37. The front and rear ends of the vulcanization bladder unit 16 are attached in a state of being sandwiched and fixed by the first adapter 36 and the second adapter 37 in advance.

  The first adapter 36 includes a large-diameter cylindrical portion 36a that fits into a large-diameter portion of the molding main shaft 17a, a small-diameter cylindrical portion 36b that fits into a small-diameter portion of the molding main shaft 17a, and a flange portion 36c. The cylindrical stepped portion 36x connecting the large-diameter cylindrical portion 36a and the small-diameter cylindrical portion 36b is engaged with the stepped portion 17x of the molding main shaft 17a for positioning.

  Further, the molding width adjustment divided between the abutting portion between the adapter unit 35 and the molding main shaft 17a, that is, the stepped portion 17x of the molding main shaft 17a and the cylindrical stepped portion 36x of the first adapter 36 is performed. By inserting the cassette 38 for adjustment, the width center of the vulcanization bladder unit 16 and the molding center of the second-stage molding machine 17 can be easily matched when the three widths during molding are changed. I can do it.

In addition, as a vulcanization bladder unit apparatus for molding and vulcanization implemented in the present invention, the primary green tire Wa molded by the first stage molding machine 11 in the manufacturing process of the pneumatic radial tire as described above is used. It is used until it is put into the vulcanization mold 21 of the vulcanizer, and has a structure as shown in FIGS.

  3 to 7, reference numerals 30a and 30b denote upper and lower bead rings, 31 denotes an upper mold ring, and 32 denotes a lower lock ring.

Cylinder the bladder unit equipment is the inside diameter portion of the primary green tire Wa molded with the first stage forming machine 11, which is clamped to the upper mold clamp ring 13 formed in a cylindrical shape and the lower mold clamp ring 14 A vulcanizing bladder unit 16 having a cylindrical bladder 15 is mounted, and the primary green tire Wa, the secondary green tire Wb, and the finished green tire are connected to the bead intervals B1, B2 during tire molding and the beads during tire vulcanization. A bead interval adjusting mechanism 22 is provided for changing the interval B3 in multiple stages.

The bead interval adjusting mechanism 22 moves the at least one of the upper die clamp ring 13 and the lower die clamp ring 14 in the approaching direction to adjust the bead intervals B1, B2, B3. And the lower clamp ring 14 are formed in a cylindrical shape so that the cylindrical slidable fitting surfaces of the upper clamp ring 13 and the lower clamp ring 14 are engaged with each other in multiple stages. Protruding locking portions 23a, 23b, and 23c to be mated and a cassette member 26 are provided.

As a specific embodiment of the present invention, the lower clamp ring 14 is fixed, and the upper clamp ring 13 is divided into a plurality of pieces in the circumferential direction as shown in FIGS. Are provided on the lower end side of the locking segment 24 of the upper clamping ring 13 when the upper clamping ring 13 is moved up and down by a hydraulic cylinder or the like. The protrusion-shaped locking portion 23c engages with the protrusion-shaped locking portions 23a, 23b formed on the outer peripheral surface at the front end and the outer peripheral surface on the lower end side of the lower clamp ring 14, or is engaged through the cassette member 26. combined, automatically adjusts positioning the primary green tire Wa, 2 primary green tire Wb and the bead spacing of the finished green tire B _1, B _2, B ₃ It is configured as constant as possible.

In other words, in order to be able to adjust the bead intervals B ₁ and B ₂ between the primary green tire Wa and the secondary green tire Wb in a multi-stage manner, a protruding locking portion 23c provided on the lower end side of the locking segment 24; A plurality of types of cassette members 26 having different lengths are detachably provided between the protrusion-shaped locking portions 23a formed on the outer peripheral surface of the tip of the lower clamp ring 14.

  Further, a seal member 27 is provided on the sliding surface between the upper mold ring 13 and the lower mold ring 14 in order to prevent air leakage when the primary green tire Wa and the secondary green tire Wb are inflated.

In the embodiment of the present invention, the engaging portions 23 a, 23 b, 23 c that are engaged in multiple stages and the plurality of types of cassette members 26 having different lengths are formed by the first stage green tire formed by the first stage molding machine 11. the bead spacing B ₁ of Wa, and the bead spacing B ₂ of the second-stage green tire Wb molded by the second-stage forming machine 17, as can be adjusted in at least three stages of the bead spacing B ₃ of tire vulcanization configuration Thus, a pneumatic radial tire can be easily manufactured.

That is, in the half sectional view of FIG. 3, the vulcanization bladder unit 16 is attached to the inner diameter portion of the primary green tire Wa in the step of FIG. 1 (c), and the bead of the primary green tire Wa at this time is shown. The interval is B ₁ , and the protruding locking portion 23 c provided on the lower end side of the locking segment 24 and the protruding locking portion 23 a formed on the outer peripheral surface of the lower end of the lower clamp ring 14 are not engaged. It has become.

Then, as shown in the half sectional view of FIG. 4, in order to make the primary green tire Wa have an outer diameter D ₁ necessary for attaching a belt tread or the like in the second stage molding machine 17, The locking segment 24 is lowered to a predetermined gap between the protruding locking portion 23c provided on the lower end side of the locking segment 24 and the protruding locking portion 23a formed on the outer peripheral surface of the tip of the lower clamp ring 14. is interposed cassette member 26 of the length engaged by the bead interval is B _2.

In this state, when a pressurized fluid such as compressed air is introduced into the bladder 15 of the vulcanizing bladder unit 16 to inflate the primary green tire Wa, the primary green tire Wa is converted into a belt tread in the second stage molding machine 17. It becomes the outer diameter D2 necessary for pasting etc.

  Then, as shown in the half sectional view of FIG. 5, a belt tread T is pasted on the outer peripheral surface of the primary green tire Wa in the second stage molding machine 17 to form a finished green tire Wb (secondary green tire Wb). It is.

In the vulcanization process, as shown in the half sectional view of FIG. 6, in order to set the bead interval required for the outer diameter at the time of vulcanization to B ₃ , the locking segment 24 of the upper clamp ring 13 is lowered, a projecting engaging portion 23c provided at the lower side of the locking segment 24, and a locking portion 23b protruding formed on the lower end side outer peripheral surface of the lower clamp ring 14 engage one another, the bead spacing B ₃ After adjusting and charging the vulcanizing mold 21 of the vulcanizer with the shape and the bead interval B ₃ maintained, the secondary green tire Wb is heated in the vulcanizing mold 21 while maintaining the inflated state. -Pressurized and cured to complete a pneumatic radial tire.

  As described above, by replacing the shaping function (function of inflating the secondary green tire) in the second stage molding machine 17 with the shaping apparatus (vulcanization bladder apparatus) for the vulcanization process, the existing first stage As a result of producing radial tires only with the molding machine 11, equipment costs can be reduced, and the vulcanization bladder unit 16 in which a belt tread is attached to a green tire can be used as it is until the vulcanization process. It is extremely advantageous for productivity and has a bead interval adjusting mechanism 22 for changing the bead interval, so that appropriate processing can be performed and the green tire is not transferred to the vulcanization bladder unit, so that the tire quality is also stable. is there.

1 (a) to 1 (l) are schematic configuration diagrams of a manufacturing process of a pneumatic radial tire embodying the present invention. It is sectional drawing of the adapter unit interposed between the shaping | molding main axis | shaft and vulcanization bladder unit of the 2nd stage molding machine which implemented this invention. It is a partial half sectional view of a state where a primary green tire is removed from the first stage molding machine and a vulcanization bladder unit is mounted on the primary green tire. FIG. 3 is a partial half sectional view of a primary green tire formed by inflating a primary green tire to have a bead interval and an outer diameter in a second stage molding machine. FIG. 5 is a partial half sectional view of a completed green tire (secondary green tire) in a state where a belt tread is attached to an outer peripheral surface of a primary green tire in a second stage molding machine. FIG. 3 is a partial half sectional view of a completed green tire (secondary green tire) when a vulcanization mold is put in a state where bead intervals necessary for an outer diameter at the time of vulcanization are set. It is an AA arrow top view of FIG.

Explanation of symbols

Wx Complete green tire Bx, By Bead spacing 1 Upper clamp ring 2 Lower clamp ring 3 Bladder 4 Vulcanized bladder unit 5a, 5b Locking part 11 First stage molding machine 12 Molding drum 13 Upper clamp ring 14 Lower clamp Ring 15 Bladder 16 Vulcanizing bladder unit 17 Second stage molding machine 17a Molding spindle 18 Conveying device 17x Stepped portion 19 Reversing device 20 Conveying device 21 Vulcanizing mold 22 Bead interval adjusting mechanism 23a, 23b, 23c Locking portion 24 Locking segment 25 Lower mold ring stopper member 26 Cassette member 27 Seal member 30a, 30b Upper and lower bead rings 31 Upper mold ring 32 Lower lock ring 35 Adapter unit 36 First adapter 37 Second adapter 36a Large diameter cylindrical portion 36b Small diameter Cylindrical portion 36c flange portion 36x cylindrical stepped portion 38 cassette Wa 1 primary green tire Wb 2 primary green tire B _1, B _2, B ₃ bead spacing D, D _1, D ₂ the outer diameter

Claims (5)

A vulcanizing bladder unit (16) for both molding and vulcanization equipped with a bead interval adjusting mechanism (22) attached to the inner diameter of the primary green tire (Wa) molded by the first stage molding machine (11) A method of attaching a bladder unit device to be attached to a molding spindle (17a) of a two-stage molding machine (17) ,
Wherein when mounting the shaping mandrel of the vulcanization bladder unit (16) a primary green tire fitted with (Wa) second-stage molding machine (17) (17a), pre-pressurizing the inner diameter portion of the vulcanization bladder unit (16) Pneumatic radial tire characterized by being inserted and mounted with an adjustable adapter unit (35) that matches the center of the width of the sulfur bladder unit (16) and the center of molding of the second stage molding machine (17) To install a bladder unit for both molding and vulcanization. Bladder unit apparatus for molding and vulcanizing硫兼the pneumatic radial tire according to claim 1, by inserting a cassette (38) to adjust the forming width between the shaping mandrel (17a) and said adapter unit (35) Installation method. A cylindrical bladder (15) clamped by an upper mold ring (13) and a lower clamp ring (14) on the inner diameter of the primary green tire (Wa) molded by the first stage molding machine (11 ) And a bead interval adjusting mechanism (22) for changing the bead interval (B1), (B2) during tire molding and the bead interval (B3) during tire vulcanization in multiple stages. An attachment device for inserting and attaching the vulcanization bladder unit (16) to the molding spindle (17a) of the second stage molding machine (17) ,
Between the shaping mandrel (17a) and the vulcanization bladder unit (16) of the second-stage molding machine (17), the width center of the second-stage molding machines vulcanization bladder unit (16) (17) An installation device for a bladder unit device for forming and vulcanizing a pneumatic radial tire, characterized in that an adjustable adapter unit (35) that matches the forming center is interposed. Between the adapter unit (35) and shaping mandrel (17a), divided molded width adjustment of the cassette (38) to the molding and pressed硫兼the pneumatic radial tire according to claim 3 which is interposed Mounting device for the bladder unit. The adapter unit (35) includes a first adapter (36) with a cylindrical step that engages with a step portion of a molding main shaft (17a) whose shaft diameter is changed in multiple stages, and a plate-like second adapter ( 37), and the vulcanized bladder unit (16) is attached in such a manner that the front and rear ends thereof are sandwiched and fixed by the first adapter (36) and the plate-like second adapter (37). A mounting device for a bladder unit device for forming and vulcanizing a pneumatic radial tire as described in 1.

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